383 Camshaft????
So i want my winter project to be doing a new cam/lifter set in my 68 newport. I have done much reading on what to shoose and well....:eek:WTF! i have no idea. too many numbers lol.
the following thread has my mods already done. https://moparforums.com/forums/f66/e...-newport-7657/ the car is street driven LOTS! Any help is greatly appreciated. Thanks |
what rear end ratio do you have in it?
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factory highway gears. i believe it is a 2.73
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Call comp cams tech line they will help you
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[quote=mr.power;56297]Call comp cams tech line they will help you pick I would stay away from mopar cams. quote]
X2! |
Heres a toy for you to play with! It will will help get an idea of what your actual, or dream set-up will work with. http://www.compcams.com/Pages/409/camquest-6.aspx
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Originally Posted by mr.power
(Post 56297)
Call comp cams tech line they will help you pick what you need for your application. I would stay away from mopar cams. They are mass produced. Comp will grind your cam for your specific application. Why guess. Its there job.
I called comp cams and they suggested the 21-237-4 Cam. here is my new question that they didnt answer for me. I gave them the information they asked for about my car and what i have and what the cam is for does not seem to match at all. Recommended cam: meant for " 9:1 to 10:1 compression. 383 needs 2500 stall. 440 needs 2000 stall. Use 700-800 CFM carburetor, headers, 3.91+ gear." My Setup: 10.5:1, No stall yet, 650 cfm carb, no headers yet, 2.73 gears.... How does that make sense..... Thanks |
Hey, Sounds like you have stock motor with 110k miles? Factory pistons? They are nowhere close to 10.5 compression ratio. 8-8.5 is real world....Like a 440 Pickup for towing, with your 4500-5000lbs and 2.76 gears...Anything large in a cam will turn it further into a pooch. Comp Xtreme energy cams are good....You need torque in this sled and not High end HP....I wouldnt go any bigger than their 268 Xtreme energy--In fact I would take the one just below it. Unless you get some 3:91-4.10 gears and a 9.5 dynamic street converter..You have cruiser..
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Originally Posted by Minnesota Guy
(Post 56681)
Hey, Sounds like you have stock motor with 110k miles? Factory pistons? They are nowhere close to 10.5 compression ratio. 8-8.5 is real world....Like a 440 Pickup for towing, with your 4500-5000lbs and 2.76 gears...Anything large in a cam will turn it further into a pooch. Comp Xtreme energy cams are good....You need torque in this sled and not High end HP....I wouldnt go any bigger than their 268 Xtreme energy--In fact I would take the one just below it. Unless you get some 3:91-4.10 gears and a 9.5 dynamic street converter..You have cruiser..
Thanks! |
I had a '68 C Body, years ago. I installed a factory 11" (10 3/4") torque coverter and a 3.23 Sure Grip. Big difference! And I think that most of the difference came from the converter.
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70 Newport, waht do you mean by a "sticker" on the inside fender? Is this the original motor? Was it originally a 2bbl? There were no 10.5:1 383's...383 Roadrunner in 69 was 10:1 and that in "real world was 9-9.5:1. 440 6 pack motors were advertised at 10:5:1 but ion real world..they were only 9:5:1 from the factory--this is because the head chambers were always bigger than advertised, along with the deck heights of the blocks. Run a compression gauge...If you are sitting at 120-130lbs per cylinder--You are 8:1 in real world....Do you have a rebuilt engine with different pistons? They would need to come out of the deck to get near 10:1 .You have to do a lot of milling to heads and block to get "advertised" compression ratios.
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Originally Posted by Minnesota Guy
(Post 56691)
70 Newport, waht do you mean by a "sticker" on the inside fender? Is this the original motor? Was it originally a 2bbl? There were no 10.5:1 383's...383 Roadrunner in 69 was 10:1 and that in "real world was 9-9.5:1. 440 6 pack motors were advertised at 10:5:1 but ion real world..they were only 9:5:1 from the factory--this is because the head chambers were always bigger than advertised, along with the deck heights of the blocks. Run a compression gauge...If you are sitting at 120-130lbs per cylinder--You are 8:1 in real world....Do you have a rebuilt engine with different pistons? They would need to come out of the deck to get near 10:1 .You have to do a lot of milling to heads and block to get "advertised" compression ratios.
Minnesota Guy, i do apologize for me being stupid as your trying to help me it is a factory motor was a 2 bbl and is now 4 bbl since my factory 2 bbl needed to be replaced. in my owners manual from 1968 ( very proud to say i have the original with the car) says that it is 10.0:1 with the 4bbl 9.5 with the 2 bbl. i will get a compression gauge on it this week and keep you guys posted. the fender tag is slightly worn and it says 10 something i thought it was 10.5. thanks guys. sorry for confusion. |
Hi 70 Newport,
I have seen alot of these apart...You have real world 8:1 compression. Unless someone milled the heads. Plus you will need different valve springs since factory 2bbl are single springs. Unless someone changed them. Go no bigger than an X Energy 268 cam. You should consider 323 or 355 gears as well and a converter with more stall. Dynamic makes excellent converters. Their 9.5 will give a lot more stall and still lock up fully on the street. Best of both worlds. 276 gears wont work. |
Originally Posted by Minnesota Guy
(Post 56761)
Hi 70 Newport,
I have seen alot of these apart...You have real world 8:1 compression. Unless someone milled the heads. Plus you will need different valve springs since factory 2bbl are single springs. Unless someone changed them. Go no bigger than an X Energy 268 cam. You should consider 323 or 355 gears as well and a converter with more stall. Dynamic makes excellent converters. Their 9.5 will give a lot more stall and still lock up fully on the street. Best of both worlds. 276 gears wont work. This is very much appreciated. I will start with gears instead. I have built drift cars with tons of power but never focused on getting this car much quicker than stock. if i do this in stages will i be okay running that 9.5 stall with my current setup and a set of gears then do cam and springs later? |
Yep, but call Dynamic and tell the guy what you have...they are very friendly and will build it for your specs..have you thought about finding a 440?
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that camquest was cool:hello:
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